Connected: An Internet Encyclopedia
RFC 821 - APPENDIX D: X.25 Transport service

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### APPENDIX D: X.25 Transport service

It may be possible to use the X.25 service [7] as provided by the Public Data Networks directly, however, it is suggested that a reliable end-to-end protocol such as TCP be used on top of X.25 connections.

Next: APPENDIX E: Theory of Reply Codes

Connected: An Internet Encyclopedia
RFC 821 - APPENDIX D: X.25 Transport service